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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94d8416d4ca207837b362fd4d578b61eb3f753c313e5fa4e31ea3425dbb8a559' 
  AND token = '3V2wAvPd0YLuBLeLleD9b5YPQvpNbhm20MBztdpR3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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