Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2e01e8b2532a444739f5c5ab70b34c304214f4f67c46890e4a411e71e3c10a' 
  AND token = 'NnOrv5rC4Z85BlQOyW9eJHqQxcLPFWt7uzBCDLdPGzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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