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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '50f413092102edc7748758365fc803aebd0a599eec35f83b0550d38bf040beba' 
  AND token = 'tJIBTzx5sI77A8X8NEjEw3sph+bn9hxS5Fwlrk0T9k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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