Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5c2d51214c1e546f6c66b39ae287e0ad04601c99fc1cdf1634e291118fa655' 
  AND token = 'cPlAMaiknVzk7RJsPMI7Qz48aPGryzhePkS1omQZFvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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