Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f55473974717e1bf6e9db35071996917c1a1b333e45cf8c25e84185e6a2bfe' 
  AND token = 'qiMDB6Lfy+ie2a09O4jRrwxi05NaYCZDKJtuwpGWiWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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