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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8effd8c3a6a191aebb3b350e5f356edd06c0217f132c828fb67e8733b7582819' 
  AND token = 'Ueboa4qrIR17yF4r5MKlwpB+9ESOhiI5TV9W+KXr3ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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