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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ef6d72db5b73f9ee094476cc88dafcea54c939d5d41597ead8f70549ab5f572' 
  AND token = 'XFX/NCRH/iVZaxbQb8kcOP8Dwo0TTXSX8abksodQ6Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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