Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5455ff0b889ce1c11d05cf2be46f84d30f11d92cd7f61dcccf8ae0792b3558d2' 
  AND token = 'q2/VdAgcEqmMMuFcGeznUZ3yhSZrRyAGiBxsvuozVzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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