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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa73db75b03429a0dabee09fee83b6864f9baf700cf51f698d8de28af60498ce' 
  AND token = 'JF39gkh0S3uRHWAekggHEKw/h5oI6ViEK2vVh29FOWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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