Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4e9f4298425627f0055c98300e2f92f84d82684ef6e7d1396e5abdc97c5ff' 
  AND token = 'dSOB4j593WQ6+rq7F3P346x47If6TL9+DUwp21vefHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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