Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cd5d07bb24003a2e9644306e5ae1f0f9b83d680f65fe7e9c2c4ba8272d79f7' 
  AND token = 'aJjiuFAOdSQc6PNA6f2y0d1KGF1PZlBddz5eYwXzyN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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