Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551ae5d6f06a56164d9da6b4a0b5c21d8e938b0e526eb6025d0fbfb0dd429344' 
  AND token = 'IpBPHzk4IDzYG7oQ9Tw7NC/pZ9FV23DOe4w+S0JlGEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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