Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b339985a18d57290a585834c190c8a587e956d376d267b411168188356935ee9' 
  AND token = 'wwwIs4iKWwBkTzwDv9t1wlpybLqnqXh3jtv/41r//FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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