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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '388383cd9a463cf9581247b1c63e69fdf357fe4e6058e880ebc7e48ef8cf3fec' 
  AND token = 'Qmo5cXtGY/zJmlWsXP1XZEZaDWMhCcVsyZdAoKFZNZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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