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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb7a16e9a409525be88d8f727ba243b367f76f8c1eff5eed3ea975a319e15ea0' 
  AND token = 'MM0MjYiYZ9lwl6oLXv6TSDT/u8MC9tmaxoAnK3StacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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