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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '558a5680f297a473b7d46651930ff1c365e8afd75d92dbbbe73472aa1ea2d4ac' 
  AND token = 'vu7y2S04PkX6upOYoB5vkR/O4fYQ3hbwKz5x6Rzbz8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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