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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a3236d844884679bfd73fca68e70156052e4ca824b02b7d5b889ea7f095c00aa' 
  AND token = 'wInb7cOumL1SEPsqdq6iHFLvYXQ9vUBtqFe4CNBnbNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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