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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74d7735ad79c1fe6179e97b63cfebdc5602be737d5606c0d8f909b5b1b06620a' 
  AND token = '4Nd1Q7Qvno/0nJkEvnW0WWsaqrheMCv1oHqfKurza7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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