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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '609b005f1693c8dd83991a51080bdc6fac8b9ca9ec6fa3e6922005b29090f026' 
  AND token = 'dvTfXtbzk36fDs8mNrE+0PA7sUSdvd9Trki3mMx/kqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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