Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80652de4c1e16cac214fd8348aa615dee2c644154a679df27eba30636590ccc' 
  AND token = '0OyDcGUygKrHdxAN4PTZMER8b1WbaB3ICgsPEBVZbGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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