Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a500f86ab8db598fb6553f19ae2d73644a4faf599fcbcf8a9f33a429ec811152' 
  AND token = 'jo1t+Q1L0lcMWMRIxggYCeCYFllCBD3n7mcNTvY9CeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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