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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e455d5476dd5aa59b383b764097c075e8a025cff2f5bad6dc64c54b4b916dc6' 
  AND token = 'I1lVuSmzjc4ofqKZNvuL1+0AOgKK9SUhE1ERdOWWLDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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