Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e248126ed1c8efb7c41b9c93211f630386b7aaecb5202c0ffe5f5d82b0356c' 
  AND token = 'RGud49NJdDOVZSfjKJDBg8Okd0Bkxiy0Lr+jbUxDbM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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