SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '62da498fde62a1f6f67ce56a2f3774a7e8bdaa93c8cdacacd467a80adcf45570' 
  AND token = 'Tv7SAm8gbzbLKOqEseJAoQ9El/VVryl8/jyuIzB3qGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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