Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac635612589127d128aa39c5dd8667b4c377dd121b8b4873368b2771543f5fd2' 
  AND token = 'UcwWRXBRKZWsOfIT6yJ+MHGTbsiAUURcyLFWMxrUxVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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