Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4ea52ff815ab7564899f5a5a4e7429d4b7d87c5c4b5ed42401b5ea88035d84' 
  AND token = 'CSqrfYWL/xEvrOA/X0de6Gzh3g8fHBW4elr9yr8gPXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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