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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e8b86fc640df2d51afd694d5d801788ce26463a1d971506dacfd7a0a6b3a211' 
  AND token = 'lHTzafLaWZ1vNM2zcdY7/S6GWnbJcz0Iz4gsFeRmh60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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