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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39fd7e2adfd22d774aec5a8e1a9ea8d1487970e09d51da59a262058e846d1508' 
  AND token = 'JVC22ikFctRW6cad5LDQ7nTDBTnE5zP2XrL489ZaUpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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