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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96e55e539ba5dbad25a3f9be321822c1f8ae20569444e185408783c100b78121' 
  AND token = '/BKcvBrG0AdMO4bTcQwBTwj2nuLoh43oaQJs6aJXOT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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