Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b7d5646c6ad5ce783ce4e1ed505c97442a2725a7350788214c333f7b1ef89' 
  AND token = 'boRD89pjdXaF6Dr3aI/Sm+sobQFUAXzye1IEpc6Q+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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