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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32b19cb34849bf8489377d77b63d7e85c0b59fa1994f2edb949900cd236d441d' 
  AND token = 'GgYyDpH4Ag5U+/I1Jy0FXFQZMkWygKpgmWmo7ymaOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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