Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfa5df2be016350ba7ff022208a7f2a628d81b7fd3caff532e9c317c74406f7' 
  AND token = 'tZ5d03NeR0znja2PpbBdljYUvzeaHyJ7EynyDz5LWdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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