Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d40ea0e900a69c913e8e83b298f216509b70947774ea0ff2b2c0b7466cde4b' 
  AND token = 'dihUhkFe0zTGxK0QT8slLfpYO1CnmuzQ9+3lyA1pnII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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