Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c302c30d6e301d191275e61485c02321e9df24e8a7e08787460cd538f37eef' 
  AND token = '/O70V8ti/E9wKju2UDLeErY+qvnwtpraeI0JCs2kJBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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