Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c4156ecf217ac402739b6311e4c4c4407b125d96e820b17fe2181d298403f1' 
  AND token = '3ylm0RdTc5Z9Bxot5BDCRRA44FKCD6xMKXIub05d4qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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