Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '124c8c7ce63c1268b230ec82d16f659d4aaffa68de6cd89fd5d59b6f32d46500' 
  AND token = 'lBV9iAeHMANJFzCdQ3Ouo7yGGqvNdDn0XOGvHlKMLg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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