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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8179a5e43f98de2f5d4f2bb1258d2ec742378637081ac582302fc956d0f2f00c' 
  AND token = '2G+FtC7S+GOdD1xhM9YI+xkFos9kOvKeoCQL30MOUdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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