Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2b59aa0750a539ba993817f7b5cf333d0078c2fa042b4d14bfe1a68cc29d94' 
  AND token = 'b0JCdIdTIOuFuZQ2GfstzfPIWqzqQwpOPqJdmY0CqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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