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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4092ae0c9f7619729f0e94ab59fbe8e418642c915e0ee1dd3e7b0d01bdf88209' 
  AND token = 'swr+4+vZ67q4WbAwo3ISiM05dOAlQM02eVo4aXYSIrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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