Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f83e621b73230b7f4474f81849617a26b6f98fbf6057f0982e183c7a9a3a4a' 
  AND token = 'cDDoYGxsYmwfjO3KduU2zcDFQzAEKazMburARo/ndpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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