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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98752e59dbd5266594d4eaf656e7d3fab293b300c24c09ef513b5a529fa9dfe1' 
  AND token = 'KLoHq2jL/C8DIcUKO0zCKaATbkqdmMlKhZ0mrMMl0Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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