Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d53e0321ab93b6d1ec41713553a9db57137fc2eebedb58d8876214d8a7a121c' 
  AND token = 'HGksR148MPUwyPiPfq3bwaGChFtV7rtf75NqpN+sug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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