Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbf7cb89176c24b90c1380ca83ca6d05ec8ab8f0e36532b0678dd29f26afb7a' 
  AND token = 'Rw3wexKh5LlrJtsAMZdjbTDtHSCd7uK0oo81QWxVSsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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