Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a835f629aad46fde9c7230601c113e92bb92bbbc7c597ab676440f68f2bb9c4' 
  AND token = '6S2RIdBBhi/fUALW8p7LwUroIKEm1aNq2gZ0z8KKmZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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