Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a943406335d72566d0bf68f0c34f788fce4299ce6b8b8a8c53cb1e84e9aac17' 
  AND token = 'iHudGcqFfNRlt5GbPEZBbvCcUXI3Fx9NWb2JnpLfoJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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