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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d93b70fa3eb6f1eae60f4fe0a9f30c62f6d20c5c095ef8514abd0f5f2b400a4' 
  AND token = 'lg7FdFBdC1qbGUdI+3gPwUdmbZ2kkwaGxgzp5TKraA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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