Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c79ea4eb1285d7875d349cf07399ddb3d658863b938e092cb1a2eaebc3b8486' 
  AND token = 'dTbBx3tvFwrEYt4a/1oQFNniQWLydtmcvER1bwqWFzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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