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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85f3dc3e39cb2c96d538f264f8964b38b5ddc00a71b8525df97c6cd87d26570f' 
  AND token = 'JjRQIORiu0w+4uZdlEIfgwbmRXKWg74uU51aWlJPMHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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