Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0270131d565afbd37e79a0d66bade2dc6350c4407d42d3f49dfe6fe3f1f719' 
  AND token = 'fi6fEiJuw/uPXRN/ikoT7mw4JGpwJmms7O/RCMuQOYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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