Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80fa8cf23d2f18b22b2d034180a2d076a7306d7f91ac30304aa9d83edc1dcb48' 
  AND token = 'g8d9SBVPeiFio+FFlbdnkLVgT40yssr1DTBRIYoRmU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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