Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e059bf1a194c2e4e191fad76cf95f8e0f118abec28cc21c863cefcd9df3ac0' 
  AND token = 'ZQipJG0i/r4JMDd+FXsN1hgGIUehTVNsvq9XgtQ2C0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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