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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '99405b3c7c0fbb22d8231043b560981d847865c405cd3bfbfb67f70199584432' 
  AND token = 'F3Ra14FgCd2+uOIfNI2I+gXL20M8ghRMThyygH8MVsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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