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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd1760d92a7384df5f3eac727b9cbb6647265866b7217fb30b853169368d51629' 
  AND token = 'kNieoRjVmihb+CjdUHbSyNa9yt18t8gHcGuKuc1Ddn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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