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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12736895af61979962bb9ada8aa21cdd2546ff1ce8c421691dea3e94d37209eb' 
  AND token = 'SPD7tsmINvhScVEYYlwq/1AGVDTyi4ak2ZxWcPKUpo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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