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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '143a3821493f9685ca3c711297701dc104c790262fad55c20ffd7f3249d6f1ca' 
  AND token = 'qyXRidj07QWnlMCcbdCQDZw6d7U/dndRZ7Wpptxi+t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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