Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c21f79688be844824e1be76f97c5900e18f24864616abb6ae34616b86104e2b' 
  AND token = '6WQqDLZzLDs4h1NpI2zYEqKtFY3ySo85gNq4lbfkEoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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