Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaaae5e8300a0f0f32c2d7876492e1c2a9291f4f9c516fdb094fa8f135bb971' 
  AND token = '+7ofgQI0cWc5sfvMnJxcrY3LnO/QTRdfoWPGCcki/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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