Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e146b21664e222cdb453012285e06ae287b1a8b08383f0660b7ecab8398bf6' 
  AND token = 'eVbeCR4xYl00V+CXq7c6cCowuQEJ437B5Dq1A+UOD5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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