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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a34bbef2776074f6945311586770fc68e12d2b5b73d8c7cb8fc4b56d27f34054' 
  AND token = 'd/Xjyi+jpo8QvOvAZkuiolXqO2pm0ccCDcIy1tCpbb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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