Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c4292327fc4ea177d47a4c7532ed57986c1e1238e9d8bf4d62542fdc611a54' 
  AND token = 'szKcCFFtZ+ZzH9e3uEYnUf22q3hpxcLdCq9bQu7J8nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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