Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf1123d1a3c2a41570392154cf6bacdd4113c18de89dea84ebc847380fff0bb' 
  AND token = 'Y7HxS/6bUkyGUKvJXu1mX6QEdH0dTo1WJG+AiBJWffE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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