Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdfe29c8ce45738426a0f70e06f972827e1444b42bc0fdbc3cc4e4603f280a2' 
  AND token = 'hSpYMGz4IrgXiLzZ2WiSQk8RMDmaTnM3y1v3QiixE9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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