Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efcfe62bf81486913672a0d8a784bda6873c3b5dbaa817f366af55eaa18150f' 
  AND token = 'mc410kFx/RNQEHaZkIZNbwQJMK7DIJxz2vhWk5vVz6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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