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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89824c75ee9c6c27dd2858af420ae92f66e9103619dabe88693dca3525b97be5' 
  AND token = 'VQ6v/fVvk3a7AQZ268yFmPuy0tKvRROeHZbm59tjlEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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