Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b1621729e1fb8e33f341da067e66255a3ae9392b37c0bab58654dc8224ab29' 
  AND token = 'pyMcg8XPFpHYQfaU+rB6qKTuuXvXEm+4nbf+nXDbceY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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