Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fc5272437ae66e6a79d328262334b8ea01e6e6403a9d8790986bf7f7b65aaa' 
  AND token = 'fINfYDsJrDsJ8R0lNJfnw4ays88EjwfqgjScoRuRHOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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