Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e71c78862dc34bc71d09888e27da7dadd637edf565a9dfcf47aa4546ed2604' 
  AND token = '+4nwKiC6Va6Tc/WqSOrnCTV01ApDnbbwBOw2LZWTF8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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