Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a127fa924643487e32d11401b1539e118645c403f60a16207b952843dd92d5' 
  AND token = 'XmmuTE1UXY+RNX9jm2jASyV3sqHWOc1UaOD5D4MPBI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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