Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fedbd3e5ba636e640c6bfb1f11127975f4ce88ab061ae4be3ecfcd0eb5a4e60' 
  AND token = 'DX6PPsScrfIcaIKeVzragg/VK4+pjN6FpdwpvuMRL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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