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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0af279684f7f213f7edcae18c51f04604348b581dcf30ee2fb66e37c287d17e1' 
  AND token = 'ZO0TxvVfmuI6ik9EF/t9n1JMilUTHdXg5Gi4SRpuFyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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