Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e75e224d450829653aa585abdbc8b6d6cde914c7a55007d06658b320438bcfca' 
  AND token = 'T7wAg0bglU9PmT5p0P3I2LbmFs6oBi188kirqdqSew8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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