Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296b62dd76a73f3b3914bfec0b6c47db5137539ba9c0321262268312e6e840eb' 
  AND token = '8MoNe2blPr5fhQehWyPuUtiO/XM02tCGP08kZ6+tdV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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