SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27253a0b04aee071f36e7c02c81e69ab29bb823b858648f36b00fb87fcd80931' 
  AND token = 'JEJQLZFWWcchO6rUTgGJ6lVDKpS8JoeTqS7Cl5fFjzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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