Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7346c05191cdde4611be0ebcccc77ec4440352b784c1a524294de136bd46644' 
  AND token = 'RrHkXxK6+yD0TSq72XQ3ktHwrMH7JVPbjd6/2FydDf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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