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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d6aa7ba3fd0853f09c3162df34bbe2cb5277879cfb356d05e89acec5d9c09c7' 
  AND token = 'qDVieE/mTmPD5VeRwNOfwzhYOcw3vWmqKJ5bXyv/bXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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