Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26184d8d4f28ef5023b514f41204075c631c7190fb5e5ddce7c64dedd2ca7c41' 
  AND token = 'ToP2rRE5eaaLfpz7AWV+QQPd4eiO7ZUm7sI1giLnWB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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