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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5dfe0ab8a87b40612705de6c52c630fdb4204ea1302edd7904919a0be2f9518b' 
  AND token = '8rJzYUeU7JAQhil20cGInMfGxriNPkSkei5paqj64So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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