"stockLevels":[
{"sku":"156320","stock":0,"deliveryTimescale":{"min":5,"max":5}},
{"sku":"156322","stock":0,"deliveryTimescale":{"min":1,"max":1}},
{"sku":"156323","stock":0,"deliveryTimescale":{"min":1,"max":1}},
{"sku":"156350","stock":0,"deliveryTimescale":{"min":5,"max":5}},
{"sku":"156351","stock":0,"deliveryTimescale":{"min":5,"max":5}},
]
select * from your_table,
jsonb_to_recordset((select your_table.config)->'stockLevels')
as t (sku int, stock int, deliveryTimescale jsonb)
where sku = 735215;