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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02baf22eb68fc2cdd4482fe7223698142326249b35a2e8b3b1b4fd0b7dbcd3ea' 
  AND token = 'P5Y59TI/I8VaKN207BijFxV4CnTgeeE1G4EV0sJZiJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}