Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b32d75920c123e761624e025b4f90e06e4a359b1a250f309c252238478e77f0' 
  AND token = '8rf/0jV47uKv+csep6N83DuhYAttqeYHSWt8YP071Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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