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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2b2985832f7f328d96186ba6ce888f75f0a1f17a9663c29461300b62f545f38' 
  AND token = 'm12qWM3iNIFoYrF5T177rW+/RJsyCr2UcHIO1t+2+5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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