Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ccbfd8a49b1ab15166c6a014ddfb74bca6c4602a1ba3b8cb05649f69638348' 
  AND token = 'xpeP5gRueq4UZK18mgQ5ss464NeDieMbV/ZUC9O6fUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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