Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33ff0a8a9bb2eab75d33e138f8e27e4734a4ed4f0b21d23abff2d67c45471cd' 
  AND token = 'CFFJCQssbEjr2h3ZxPRN/MsHU3UD1VyJALoxRnquBCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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