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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9cb019051f6f99cbf528bb52b5f9de8f2865f4476a52818872870f4ebea16a16' 
  AND token = 'KVSr9Xj9um8pMvFkSok56kk0xzn5Z5C3GbFG6mXYkzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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