Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63ef349cd02bf06cb241e8076854b5ffc1072e21e6c037f01701840826a6933' 
  AND token = 'fWamU+Q7EJWzqdS19byhLwQbSpU7pJLiatM821ysWXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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