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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '707521f5730a6db1636f34470e0ef508864bc68fa94aed65babd29538714aba9' 
  AND token = 'UPOIXQoGKFKvkHzmieqbs1Ho0p2aJFiTo668Ft+3pOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00304

JSON explain

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