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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '741862c9ee621ab4794f07f1b6cac8e823474914b0f14f0bf17af94237aac3cf' 
  AND token = 'uohL2ocrk2GDu9R6dJ7csHEPsNQVlxh3F4vdFifmT6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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