Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f692e48fd5c71fd94ecaece13f9b70e5a6916269b338ed8329bbbb9eb6dba36' 
  AND token = 'hNDRJGh9BmPg3NFOrYw1h0r70+98EnvtBMwrcEsqcik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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