Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968a9b877f52c27836556f92d09d6ada61c6dc249c4f6abd3c1b9d592a327fef' 
  AND token = '21cZ3NhwoEO1k5WBjktg08tAUwuG1rmyjhndYb5JsXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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