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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d573ca4a609f22424948a863ff0df7a2545ca53d3f6379b1cc3385d5c487b4c' 
  AND token = 'NCSer+5dQ3neD9j1qxbjaosb23vtfTHBtRac2Mjpjos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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