Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832d648dcea848106248c0364834948164b8845d2226c82ad95e6d4cebdfdc36' 
  AND token = '/ZlBE1i5++ljjHlT9j8NncXaaEqb+pAyb1FPBy37+4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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