Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d06f2943261996e0e8fd0ff3a4513d81c50f6d4c8d6da0b303bc03472bd1c94' 
  AND token = 'MDWkD9hQAbSJ6b1/fXypjJ/HeOTpt41kIHYs3mCaq7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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