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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39a2748a85edbe4540c7ef46a733fc4e54a2f6bb8f1cb6afa815e8cf9926de7a' 
  AND token = 'RmqsdpP/YQa8cZUXSsEpxxrE0qHdIX9Z6zEfDBXTxTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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