Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187884a81ab2d58a85d9ad04b697e8c69a014bed2504643b3de6e05a541d4dd6' 
  AND token = 'MKdbwLrDeZJadyS6b5ILZJAPDha2e4SDok0gE5BQmyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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