Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb8ff63b05d4f9dcac98c5006d26ff47cd8c8d87f21fff4db65168c571e5cb6' 
  AND token = 'GZj547zBAwY2/VsKAY9DMQS+czSqwzaPdx3sxRNkNbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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