Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425e37a15e479763deacc877d44e1ed43cd06efa786bbc9837d63970ea495c49' 
  AND token = 'M60MshQFI+Udsibg0saQLb0ZNgdNh7/TXobx5uHTrL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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