Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56565f7a4b5002dd116edb0b2722cfb18e93f062d03e5ae364997744b9a4fe4' 
  AND token = 'MB1UPTzGIuKDvLV1PrRGc5ktYvMFCiPZsQ0nSklkulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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