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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd41e285053c3244270a4a753edc8f99a457929fbee396939d2d3a75f9f7853f1' 
  AND token = 'ZVWNf/E/C5WKCC9HZTCA/DdkuiQLZCrMkAsNW4RjdGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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