Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdccbaced91ad907d64f197edcf38b459c4acbf856e9b130c75ae60237ddf3e9' 
  AND token = 'gfECSbv5Qf2BXr0Bh7aH5ZZG3WgHHNRGWJNMD+ZXebY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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