Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c390032caaee84c23ccd7c63a0763d750f5ca33a6a3f5cd2004f729bf837f712' 
  AND token = '3jxLjgT26R4yILzjIE7Cf4a9cTGTf3xaSQs1rsurNWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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