Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84305b7dd54ae264a43a63da7a4d981d6de827c243830c3b0bc3720f0ab5fa7' 
  AND token = 'ZBSl8SytBBeuKKtpSKSPoj+Am3JUHhN8jzGlNwa7q3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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