Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a9d0a422d8660f0e88a444a074a81c4acf37b0575543331c11877717b34435' 
  AND token = 'xNIWiWFTh2hUajZOzaJpMpymLq/VeotCeFJpY3BMADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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