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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98a6834f8521c385c7a7e8fd2900076d77c0ce35ec35877f265f5b3b68703c68' 
  AND token = 'OCDRkVA8OfU4NDr0nwE7r14QyQIDWNYnk4db9mMWobk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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