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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9781efef8cd1e6488a5f684d87738358d3db85bf37ea40f46f0cbeed0634ce1b' 
  AND token = 'NouwyD3juiJO69zREpCB89bJtte4c/VCS20edK/oNqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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