Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb652db35f06ed3f0854ff01b791cd4b7086825b7efe6c9405c73c5026cd271' 
  AND token = 'I7tTN992lN3N7UW2ng/D7No+qUq63R2E3VhmorgGP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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