Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed676037b00feeb65af7dabb47be090ae823e10a9af3d27514c1ae681c7db4bb' 
  AND token = 'iLJaGom11HVjHKM5N217VtAJpwjwP5sSgd9FLNkM3NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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