Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd547adde38ca28a561371728866319621a0ff8bb23d8730b21fdd5a214a8fe98' 
  AND token = 'SOE/Ie9Du3ewUsfb9AK5MzwDpkwUx2BWIppudLPP+84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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