Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c63ca2b569fc3789dd05b38dfd633448d64993ccf438a2bdd30f5e4487ef2ec1' 
  AND token = 'Pe30QjI2G7mQWRqI6TbMxl1qGaauaCQseOzyar64EOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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