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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7adc8b172f75a101af170fd61370602cf816ce06345324fb621c5d40b098f376' 
  AND token = 'iZmw81Q/Tph5hNKdslpVCGI40Zmwtt74dAHgF4pQ26Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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